
十万个为什么(2)生物与环境
树叶的形状为什么是各种各样的?
花为什么是五颜六色的?
爬山虎为什么能爬墙?
。。。。。。
4大科普主题之二《生物与环境》
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46
29期
Pencil lead, primarily composed of graphite and clay, is a conductive material due to its inherent electrical conductivity. Graphite content affects the conductivity: higher in darker leads, making thicker and shorter ones more likely to conduct electricity. Hardness and color also play a role, with less graphite content in lighter colors resulting in lower conductivity.


19期

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